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Capital Stock (Summary of Common Stock Activity) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common shares outstanding at beginning of period (in shares)	134,275,609	139,840,228	139,441,298
Shares repurchased (in shares)	(92,167)	(6,157,010)	(162,563)
Shares issued upon exercise of employee stock options (in shares)	0	299,050	348,640
Restricted stock issued to employees, net of forfeitures (in shares)	958,672	269,025	187,209
Shares issued to non-employee directors (in shares)	31,834	24,316	25,644
Common shares outstanding at end of period (in shares)	135,173,948	134,275,609	139,840,228

X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services.

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Number of share options (or share units) exercised during the current period.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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